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Multiple number and letter comparison: directionality and accessibility in numeric and alphabetic memories
1Department of Psychology and Anthropology, The University of Texas-Pan American, Edinburg 78541-2999, USA. jjou@panam.edu
The American Journal of Psychology
|January 16, 2004
Summary
This study contrasted numeric and alphabetic serial order memory, finding differences in directional bias and item access speed. The middle item effect was observed in both number and letter arrays.
Area of Science:
- Cognitive Psychology
- Human Memory Studies
Background:
- Serial order memory is crucial for cognitive processing.
- Understanding differences between numeric and alphabetic memory aids in decoding cognitive architecture.
Purpose of the Study:
- To investigate and contrast numeric and alphabetic serial order memory.
- To identify key processes in serial order memory: computational complexity, directionality, and accessibility.
Main Methods:
- Subjects performed comparative judgments on sets of 2, 3, or 5 numbers or letters.
- Measured directional bias and serial position effects for numeric and alphabetic stimuli.
- Analyzed speed differences and computational complexity in memory recall.
Main Results:
- Numeric memory showed a slight backward bias for single digits, while alphabetic memory had a forward bias.
- Number access speed decreased linearly, unlike the varied pattern in alphabet access.
- The middle item effect was generalized from letters to numbers.
Conclusions:
- Numeric and alphabetic serial order memory exhibit distinct processing characteristics.
- Directionality and accessibility are key factors differentiating memory systems.
- The middle item effect is a robust phenomenon across different symbolic systems.
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